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Thanks for sharing. I also found the on/off signal on the motherboard. But, it's beyond my skills to make a a solid connection. Instead I used the inverted PWM signal with RC filter and inverse comparator circuit to drive a relay. That's a lot of components for such an easy job. But is works. The downside is that the lights will go on after a power surge or when the motherboard dies. But that applies to most circuits that are described in this forum.